Research Of Coupling Technology For Optical Communication Components

Polymer Optical Fiber (POF) will be extensively used in Local Area Network with high speed and large capacities. So studies on the POFs and POF coupler are actively launched abroad. In this thesis, numerical calculation and experiment measurement for polymer mix rod optical fiber coupler have been done. In the first chapter, some performances of the POFs, such as its development, fundamental performances and application have been presented. Then, its advantages in short distance communication over silic optical fiber and have been discussed, and we conclude that POF is a good choice for high speed LAN. Two kinds of numerical calculation methods, namely finite difference time domain (FDTD) and ray tracing method have been discussed and compared from the second chapter to the fourth chapter. FDTD method has very high calculation precision, but its efficiency is relatively low. Although ray tracing method deals with electromagnetic wave approximately, it has enough precision and high calculation efficiency for multi-mode polymer optical fiber.In the fifth chapter, optical power distribution in offset-launched multimode optical fiber is calculated by the ray tracing method and measured by the CMOS optical detector array, in the case of different offsets and different length of the optical fiber. The results of the numerical calculation and experimental measurement consistently indicate that more high-order modes will be excited with more launching offset and the angular uniformity of the power distribution increases with the length of the optical fiber.In the sixth chapter, a series of coupler samples is made and tested. The measurement results indicate that the performance of the offset-launched 1×7 coupler is superior to 1×7 taper optical fiber coupler. It can meet the requirement of practicality with a 1.18dB insertion loss and a 0.92dB nonuniformity of power distribution.